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[ Upstream commit 36959d18c3cf09b3c12157c6950e18652067de77 ] If GET_SEGNO return NULL_SEGNO for some unecpected case, update_sit_entry will access invalid memory address, cause system crash. It is better to do sanity check about GET_SEGNO just like update_segment_mtime & locate_dirty_segment. Also remove some redundant judgment code. Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 3c2c864f19490da6e892290441ba7dcc7bae2576) [Vegard: drop hunk in {f2fs_,}allocate_data_block due to missing commit 65f1b80b33378501ea552ef085e9c31739af356c ('Revert "f2fs: handle dirty segments inside refresh_sit_entry"') -- the important part of the patch is the addition of the segno check.] Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>